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- // SPDX-License-Identifier: GPL-2.0
- // Copyright (C) STMicroelectronics 2019
- // Author(s): Fabrice Gasnier <fabrice.gasnier@st.com>.
- #include <linux/mfd/syscon.h>
- #include <linux/module.h>
- #include <linux/of_device.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #include <linux/regulator/driver.h>
- #include <linux/regulator/of_regulator.h>
- /* STM32H7 SYSCFG register */
- #define STM32H7_SYSCFG_PMCR 0x04
- #define STM32H7_SYSCFG_BOOSTE_MASK BIT(8)
- /* STM32MP1 SYSCFG has set and clear registers */
- #define STM32MP1_SYSCFG_PMCSETR 0x04
- #define STM32MP1_SYSCFG_PMCCLRR 0x44
- #define STM32MP1_SYSCFG_EN_BOOSTER_MASK BIT(8)
- static const struct regulator_ops stm32h7_booster_ops = {
- .enable = regulator_enable_regmap,
- .disable = regulator_disable_regmap,
- .is_enabled = regulator_is_enabled_regmap,
- };
- static const struct regulator_desc stm32h7_booster_desc = {
- .name = "booster",
- .supply_name = "vdda",
- .n_voltages = 1,
- .type = REGULATOR_VOLTAGE,
- .fixed_uV = 3300000,
- .ramp_delay = 66000, /* up to 50us to stabilize */
- .ops = &stm32h7_booster_ops,
- .enable_reg = STM32H7_SYSCFG_PMCR,
- .enable_mask = STM32H7_SYSCFG_BOOSTE_MASK,
- .owner = THIS_MODULE,
- };
- static int stm32mp1_booster_enable(struct regulator_dev *rdev)
- {
- return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
- STM32MP1_SYSCFG_EN_BOOSTER_MASK);
- }
- static int stm32mp1_booster_disable(struct regulator_dev *rdev)
- {
- return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
- STM32MP1_SYSCFG_EN_BOOSTER_MASK);
- }
- static const struct regulator_ops stm32mp1_booster_ops = {
- .enable = stm32mp1_booster_enable,
- .disable = stm32mp1_booster_disable,
- .is_enabled = regulator_is_enabled_regmap,
- };
- static const struct regulator_desc stm32mp1_booster_desc = {
- .name = "booster",
- .supply_name = "vdda",
- .n_voltages = 1,
- .type = REGULATOR_VOLTAGE,
- .fixed_uV = 3300000,
- .ramp_delay = 66000,
- .ops = &stm32mp1_booster_ops,
- .enable_reg = STM32MP1_SYSCFG_PMCSETR,
- .enable_mask = STM32MP1_SYSCFG_EN_BOOSTER_MASK,
- .owner = THIS_MODULE,
- };
- static int stm32_booster_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct device_node *np = pdev->dev.of_node;
- struct regulator_config config = { };
- const struct regulator_desc *desc;
- struct regulator_dev *rdev;
- struct regmap *regmap;
- int ret;
- regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
- if (IS_ERR(regmap))
- return PTR_ERR(regmap);
- desc = (const struct regulator_desc *)
- of_match_device(dev->driver->of_match_table, dev)->data;
- config.regmap = regmap;
- config.dev = dev;
- config.of_node = np;
- config.init_data = of_get_regulator_init_data(dev, np, desc);
- rdev = devm_regulator_register(dev, desc, &config);
- if (IS_ERR(rdev)) {
- ret = PTR_ERR(rdev);
- dev_err(dev, "register failed with error %d\n", ret);
- return ret;
- }
- return 0;
- }
- static const struct of_device_id stm32_booster_of_match[] = {
- {
- .compatible = "st,stm32h7-booster",
- .data = (void *)&stm32h7_booster_desc
- }, {
- .compatible = "st,stm32mp1-booster",
- .data = (void *)&stm32mp1_booster_desc
- }, {
- },
- };
- MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
- static struct platform_driver stm32_booster_driver = {
- .probe = stm32_booster_probe,
- .driver = {
- .name = "stm32-booster",
- .of_match_table = of_match_ptr(stm32_booster_of_match),
- },
- };
- module_platform_driver(stm32_booster_driver);
- MODULE_LICENSE("GPL v2");
- MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
- MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
- MODULE_ALIAS("platform:stm32-booster");
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